Previous studies have suggested a link between HRT use and breast cancer. Ahmedin Jemal and colleagues at the American Cancer Society conducted statistical analysis to examine patterns in invasive and in situ breast cancer incidence in relation to age, tumour size at diagnosis and disease stage. Regular mammography screening starts at 40 and HRT is most common in women aged 50 or older, so the study focussed on women age 40 and above.
The research team examined trends in breast cancer incidence in the National Cancer Institute’s Surveillance Epidemiology and End Results database from 1975 to 2003. The database includes women from 5 US States (Connecticut, Hawaii, Iowa, New Mexico, and Utah) and 5 metropolitan cities (Atlanta, Detroit, San-Francisco, and Seattle). Almost 400,000 invasive and 60,000 in situ cases of breast cancer were diagnosed in that time. Breast cancer incidence rates increased by almost 40% between 1980 and 1998, and then showed a downward trend with a dramatic decrease from 2002 to 2003. The greatest decline was in women who had small tumours, early stage disease, estrogen/progestin positive tumours, and who were aged 55 or older.
Jemal et al concluded that the speed of decrease in breast cancer incidence, following the dramatic reduction in HRT use after the Women’s Health initiative publication in 2002, likely reflects the early consequences of reductions in HRT use, while the downturn in incidence rates across multiple age groups beginning 1998/1999 reflects the saturation of mammography.
Researchers simplify tiny structures' construction drip by drip
12.11.2018 | Princeton University, Engineering School
Mandibular movement monitoring may help improve oral sleep apnea devices
06.11.2018 | Elsevier
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
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Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.
When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure
Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...
Physicists at ETH Zurich demonstrate how errors that occur during the manipulation of quantum system can be monitored and corrected on the fly
The field of quantum computation has seen tremendous progress in recent years. Bit by bit, quantum devices start to challenge conventional computers, at least...
09.11.2018 | Event News
06.11.2018 | Event News
23.10.2018 | Event News
15.11.2018 | Earth Sciences
15.11.2018 | Physics and Astronomy
15.11.2018 | Physics and Astronomy